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The molecular property that determines which type of intermolecular bond can exist between two molecules is called polarity. A polar molecule is one in which one side of the molecule is slightly positively charged and the opposite side is slightly negatively charged.s a result, C-H and Cl-N bonds are almost completely non-polar. Bonds between carbon and chlorine, carbon and bromine, and carbon and iodine are also only very slightly polar. But electrons are in constant motion, and there are brief periods of time in which they are slightly to one side of the molecule or the other.
Covalent bonds are the strongest chemical bonds contributing to protein structure. Covalent bonds arise when two atoms share electrons. In addition to the covalent bonds that connect the atoms of a single amino acid and the covalent peptide bond that links amino acids in a protein chain, covalent bonds between cysteine side chains can be important determinants of protein structure. Cysteine is the sole amino acid whose side chain can form covalent bonds, yielding disulfide bridges with other cysteine side chains: --CH 2-S-S-CH 2-- .